| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.database.sqlite; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.compat.annotation.UnsupportedAppUsage; |
| import android.content.ContentValues; |
| import android.database.Cursor; |
| import android.database.DatabaseUtils; |
| import android.os.Build; |
| import android.os.CancellationSignal; |
| import android.os.OperationCanceledException; |
| import android.provider.BaseColumns; |
| import android.text.TextUtils; |
| import android.util.ArrayMap; |
| import android.util.Log; |
| |
| import com.android.internal.util.ArrayUtils; |
| |
| import libcore.util.EmptyArray; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * This is a convenience class that helps build SQL queries to be sent to |
| * {@link SQLiteDatabase} objects. |
| */ |
| public class SQLiteQueryBuilder { |
| private static final String TAG = "SQLiteQueryBuilder"; |
| |
| private static final Pattern sAggregationPattern = Pattern.compile( |
| "(?i)(AVG|COUNT|MAX|MIN|SUM|TOTAL|GROUP_CONCAT)\\((.+)\\)"); |
| |
| private Map<String, String> mProjectionMap = null; |
| private Collection<Pattern> mProjectionGreylist = null; |
| |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| private String mTables = ""; |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| private StringBuilder mWhereClause = null; // lazily created |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| private boolean mDistinct; |
| private SQLiteDatabase.CursorFactory mFactory; |
| |
| private static final int STRICT_PARENTHESES = 1 << 0; |
| private static final int STRICT_COLUMNS = 1 << 1; |
| private static final int STRICT_GRAMMAR = 1 << 2; |
| |
| private int mStrictFlags; |
| |
| public SQLiteQueryBuilder() { |
| mDistinct = false; |
| mFactory = null; |
| } |
| |
| /** |
| * Mark the query as {@code DISTINCT}. |
| * |
| * @param distinct if true the query is {@code DISTINCT}, otherwise it isn't |
| */ |
| public void setDistinct(boolean distinct) { |
| mDistinct = distinct; |
| } |
| |
| /** |
| * Get if the query is marked as {@code DISTINCT}, as last configured by |
| * {@link #setDistinct(boolean)}. |
| */ |
| public boolean isDistinct() { |
| return mDistinct; |
| } |
| |
| /** |
| * Returns the list of tables being queried |
| * |
| * @return the list of tables being queried |
| */ |
| public @Nullable String getTables() { |
| return mTables; |
| } |
| |
| /** |
| * Sets the list of tables to query. Multiple tables can be specified to perform a join. |
| * For example: |
| * setTables("foo, bar") |
| * setTables("foo LEFT OUTER JOIN bar ON (foo.id = bar.foo_id)") |
| * |
| * @param inTables the list of tables to query on |
| */ |
| public void setTables(@Nullable String inTables) { |
| mTables = inTables; |
| } |
| |
| /** |
| * Append a chunk to the {@code WHERE} clause of the query. All chunks appended are surrounded |
| * by parenthesis and {@code AND}ed with the selection passed to {@link #query}. The final |
| * {@code WHERE} clause looks like: |
| * <p> |
| * WHERE (<append chunk 1><append chunk2>) AND (<query() selection parameter>) |
| * |
| * @param inWhere the chunk of text to append to the {@code WHERE} clause. |
| */ |
| public void appendWhere(@NonNull CharSequence inWhere) { |
| if (mWhereClause == null) { |
| mWhereClause = new StringBuilder(inWhere.length() + 16); |
| } |
| mWhereClause.append(inWhere); |
| } |
| |
| /** |
| * Append a chunk to the {@code WHERE} clause of the query. All chunks appended are surrounded |
| * by parenthesis and ANDed with the selection passed to {@link #query}. The final |
| * {@code WHERE} clause looks like: |
| * <p> |
| * WHERE (<append chunk 1><append chunk2>) AND (<query() selection parameter>) |
| * |
| * @param inWhere the chunk of text to append to the {@code WHERE} clause. it will be escaped |
| * to avoid SQL injection attacks |
| */ |
| public void appendWhereEscapeString(@NonNull String inWhere) { |
| if (mWhereClause == null) { |
| mWhereClause = new StringBuilder(inWhere.length() + 16); |
| } |
| DatabaseUtils.appendEscapedSQLString(mWhereClause, inWhere); |
| } |
| |
| /** |
| * Add a standalone chunk to the {@code WHERE} clause of this query. |
| * <p> |
| * This method differs from {@link #appendWhere(CharSequence)} in that it |
| * automatically appends {@code AND} to any existing {@code WHERE} clause |
| * already under construction before appending the given standalone |
| * expression wrapped in parentheses. |
| * |
| * @param inWhere the standalone expression to append to the {@code WHERE} |
| * clause. It will be wrapped in parentheses when it's appended. |
| */ |
| public void appendWhereStandalone(@NonNull CharSequence inWhere) { |
| if (mWhereClause == null) { |
| mWhereClause = new StringBuilder(inWhere.length() + 16); |
| } |
| if (mWhereClause.length() > 0) { |
| mWhereClause.append(" AND "); |
| } |
| mWhereClause.append('(').append(inWhere).append(')'); |
| } |
| |
| /** |
| * Sets the projection map for the query. The projection map maps |
| * from column names that the caller passes into query to database |
| * column names. This is useful for renaming columns as well as |
| * disambiguating column names when doing joins. For example you |
| * could map "name" to "people.name". If a projection map is set |
| * it must contain all column names the user may request, even if |
| * the key and value are the same. |
| * |
| * @param columnMap maps from the user column names to the database column names |
| */ |
| public void setProjectionMap(@Nullable Map<String, String> columnMap) { |
| mProjectionMap = columnMap; |
| } |
| |
| /** |
| * Gets the projection map for the query, as last configured by |
| * {@link #setProjectionMap(Map)}. |
| */ |
| public @Nullable Map<String, String> getProjectionMap() { |
| return mProjectionMap; |
| } |
| |
| /** |
| * Sets a projection greylist of columns that will be allowed through, even |
| * when {@link #setStrict(boolean)} is enabled. This provides a way for |
| * abusive custom columns like {@code COUNT(*)} to continue working. |
| */ |
| public void setProjectionGreylist(@Nullable Collection<Pattern> projectionGreylist) { |
| mProjectionGreylist = projectionGreylist; |
| } |
| |
| /** |
| * Gets the projection greylist for the query, as last configured by |
| * {@link #setProjectionGreylist}. |
| */ |
| public @Nullable Collection<Pattern> getProjectionGreylist() { |
| return mProjectionGreylist; |
| } |
| |
| /** {@hide} */ |
| @Deprecated |
| public void setProjectionAggregationAllowed(boolean projectionAggregationAllowed) { |
| } |
| |
| /** {@hide} */ |
| @Deprecated |
| public boolean isProjectionAggregationAllowed() { |
| return true; |
| } |
| |
| /** |
| * Sets the cursor factory to be used for the query. You can use |
| * one factory for all queries on a database but it is normally |
| * easier to specify the factory when doing this query. |
| * |
| * @param factory the factory to use. |
| */ |
| public void setCursorFactory(@Nullable SQLiteDatabase.CursorFactory factory) { |
| mFactory = factory; |
| } |
| |
| /** |
| * Gets the cursor factory to be used for the query, as last configured by |
| * {@link #setCursorFactory(android.database.sqlite.SQLiteDatabase.CursorFactory)}. |
| */ |
| public @Nullable SQLiteDatabase.CursorFactory getCursorFactory() { |
| return mFactory; |
| } |
| |
| /** |
| * When set, the selection is verified against malicious arguments. When |
| * using this class to create a statement using |
| * {@link #buildQueryString(boolean, String, String[], String, String, String, String, String)}, |
| * non-numeric limits will raise an exception. If a projection map is |
| * specified, fields not in that map will be ignored. If this class is used |
| * to execute the statement directly using |
| * {@link #query(SQLiteDatabase, String[], String, String[], String, String, String)} |
| * or |
| * {@link #query(SQLiteDatabase, String[], String, String[], String, String, String, String)}, |
| * additionally also parenthesis escaping selection are caught. To |
| * summarize: To get maximum protection against malicious third party apps |
| * (for example content provider consumers), make sure to do the following: |
| * <ul> |
| * <li>Set this value to true</li> |
| * <li>Use a projection map</li> |
| * <li>Use one of the query overloads instead of getting the statement as a |
| * sql string</li> |
| * </ul> |
| * <p> |
| * This feature is disabled by default on each newly constructed |
| * {@link SQLiteQueryBuilder} and needs to be manually enabled. |
| */ |
| public void setStrict(boolean strict) { |
| if (strict) { |
| mStrictFlags |= STRICT_PARENTHESES; |
| } else { |
| mStrictFlags &= ~STRICT_PARENTHESES; |
| } |
| } |
| |
| /** |
| * Get if the query is marked as strict, as last configured by |
| * {@link #setStrict(boolean)}. |
| */ |
| public boolean isStrict() { |
| return (mStrictFlags & STRICT_PARENTHESES) != 0; |
| } |
| |
| /** |
| * When enabled, verify that all projections and {@link ContentValues} only |
| * contain valid columns as defined by {@link #setProjectionMap(Map)}. |
| * <p> |
| * This enforcement applies to {@link #insert}, {@link #query}, and |
| * {@link #update} operations. Any enforcement failures will throw an |
| * {@link IllegalArgumentException}. |
| * <p> |
| * This feature is disabled by default on each newly constructed |
| * {@link SQLiteQueryBuilder} and needs to be manually enabled. |
| */ |
| public void setStrictColumns(boolean strictColumns) { |
| if (strictColumns) { |
| mStrictFlags |= STRICT_COLUMNS; |
| } else { |
| mStrictFlags &= ~STRICT_COLUMNS; |
| } |
| } |
| |
| /** |
| * Get if the query is marked as strict, as last configured by |
| * {@link #setStrictColumns(boolean)}. |
| */ |
| public boolean isStrictColumns() { |
| return (mStrictFlags & STRICT_COLUMNS) != 0; |
| } |
| |
| /** |
| * When enabled, verify that all untrusted SQL conforms to a restricted SQL |
| * grammar. Here are the restrictions applied: |
| * <ul> |
| * <li>In {@code WHERE} and {@code HAVING} clauses: subqueries, raising, and |
| * windowing terms are rejected. |
| * <li>In {@code GROUP BY} clauses: only valid columns are allowed. |
| * <li>In {@code ORDER BY} clauses: only valid columns, collation, and |
| * ordering terms are allowed. |
| * <li>In {@code LIMIT} clauses: only numerical values and offset terms are |
| * allowed. |
| * </ul> |
| * All column references must be valid as defined by |
| * {@link #setProjectionMap(Map)}. |
| * <p> |
| * This enforcement applies to {@link #query}, {@link #update} and |
| * {@link #delete} operations. This enforcement does not apply to trusted |
| * inputs, such as those provided by {@link #appendWhere}. Any enforcement |
| * failures will throw an {@link IllegalArgumentException}. |
| * <p> |
| * This feature is disabled by default on each newly constructed |
| * {@link SQLiteQueryBuilder} and needs to be manually enabled. |
| */ |
| public void setStrictGrammar(boolean strictGrammar) { |
| if (strictGrammar) { |
| mStrictFlags |= STRICT_GRAMMAR; |
| } else { |
| mStrictFlags &= ~STRICT_GRAMMAR; |
| } |
| } |
| |
| /** |
| * Get if the query is marked as strict, as last configured by |
| * {@link #setStrictGrammar(boolean)}. |
| */ |
| public boolean isStrictGrammar() { |
| return (mStrictFlags & STRICT_GRAMMAR) != 0; |
| } |
| |
| /** |
| * Build an SQL query string from the given clauses. |
| * |
| * @param distinct true if you want each row to be unique, false otherwise. |
| * @param tables The table names to compile the query against. |
| * @param columns A list of which columns to return. Passing null will |
| * return all columns, which is discouraged to prevent reading |
| * data from storage that isn't going to be used. |
| * @param where A filter declaring which rows to return, formatted as an SQL |
| * {@code WHERE} clause (excluding the {@code WHERE} itself). Passing {@code null} will |
| * return all rows for the given URL. |
| * @param groupBy A filter declaring how to group rows, formatted as an SQL |
| * {@code GROUP BY} clause (excluding the {@code GROUP BY} itself). Passing {@code null} |
| * will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in the cursor, |
| * if row grouping is being used, formatted as an SQL {@code HAVING} |
| * clause (excluding the {@code HAVING} itself). Passing null will cause |
| * all row groups to be included, and is required when row |
| * grouping is not being used. |
| * @param orderBy How to order the rows, formatted as an SQL {@code ORDER BY} clause |
| * (excluding the {@code ORDER BY} itself). Passing null will use the |
| * default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as {@code LIMIT} clause. Passing null denotes no {@code LIMIT} clause. |
| * @return the SQL query string |
| */ |
| public static String buildQueryString( |
| boolean distinct, String tables, String[] columns, String where, |
| String groupBy, String having, String orderBy, String limit) { |
| if (TextUtils.isEmpty(groupBy) && !TextUtils.isEmpty(having)) { |
| throw new IllegalArgumentException( |
| "HAVING clauses are only permitted when using a groupBy clause"); |
| } |
| |
| StringBuilder query = new StringBuilder(120); |
| |
| query.append("SELECT "); |
| if (distinct) { |
| query.append("DISTINCT "); |
| } |
| if (columns != null && columns.length != 0) { |
| appendColumns(query, columns); |
| } else { |
| query.append("* "); |
| } |
| query.append("FROM "); |
| query.append(tables); |
| appendClause(query, " WHERE ", where); |
| appendClause(query, " GROUP BY ", groupBy); |
| appendClause(query, " HAVING ", having); |
| appendClause(query, " ORDER BY ", orderBy); |
| appendClause(query, " LIMIT ", limit); |
| |
| return query.toString(); |
| } |
| |
| private static void appendClause(StringBuilder s, String name, String clause) { |
| if (!TextUtils.isEmpty(clause)) { |
| s.append(name); |
| s.append(clause); |
| } |
| } |
| |
| /** |
| * Add the names that are non-null in columns to s, separating |
| * them with commas. |
| */ |
| public static void appendColumns(StringBuilder s, String[] columns) { |
| int n = columns.length; |
| |
| for (int i = 0; i < n; i++) { |
| String column = columns[i]; |
| |
| if (column != null) { |
| if (i > 0) { |
| s.append(", "); |
| } |
| s.append(column); |
| } |
| } |
| s.append(' '); |
| } |
| |
| /** |
| * Perform a query by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to query on |
| * @param projectionIn A list of which columns to return. Passing |
| * null will return all columns, which is discouraged to prevent |
| * reading data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given URL. |
| * @param selectionArgs You may include ?s in selection, which |
| * will be replaced by the values from selectionArgs, in order |
| * that they appear in the selection. The values will be bound |
| * as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted |
| * as an SQL {@code GROUP BY} clause (excluding the {@code GROUP BY} |
| * itself). Passing null will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in |
| * the cursor, if row grouping is being used, formatted as an |
| * SQL {@code HAVING} clause (excluding the {@code HAVING} itself). Passing |
| * null will cause all row groups to be included, and is |
| * required when row grouping is not being used. |
| * @param sortOrder How to order the rows, formatted as an SQL |
| * {@code ORDER BY} clause (excluding the {@code ORDER BY} itself). Passing null |
| * will use the default sort order, which may be unordered. |
| * @return a cursor over the result set |
| * @see android.content.ContentResolver#query(android.net.Uri, String[], |
| * String, String[], String) |
| */ |
| public Cursor query(SQLiteDatabase db, String[] projectionIn, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String sortOrder) { |
| return query(db, projectionIn, selection, selectionArgs, groupBy, having, sortOrder, |
| null /* limit */, null /* cancellationSignal */); |
| } |
| |
| /** |
| * Perform a query by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to query on |
| * @param projectionIn A list of which columns to return. Passing |
| * null will return all columns, which is discouraged to prevent |
| * reading data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given URL. |
| * @param selectionArgs You may include ?s in selection, which |
| * will be replaced by the values from selectionArgs, in order |
| * that they appear in the selection. The values will be bound |
| * as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted |
| * as an SQL {@code GROUP BY} clause (excluding the {@code GROUP BY} |
| * itself). Passing null will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in |
| * the cursor, if row grouping is being used, formatted as an |
| * SQL {@code HAVING} clause (excluding the {@code HAVING} itself). Passing |
| * null will cause all row groups to be included, and is |
| * required when row grouping is not being used. |
| * @param sortOrder How to order the rows, formatted as an SQL |
| * {@code ORDER BY} clause (excluding the {@code ORDER BY} itself). Passing null |
| * will use the default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as {@code LIMIT} clause. Passing null denotes no {@code LIMIT} clause. |
| * @return a cursor over the result set |
| * @see android.content.ContentResolver#query(android.net.Uri, String[], |
| * String, String[], String) |
| */ |
| public Cursor query(SQLiteDatabase db, String[] projectionIn, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String sortOrder, String limit) { |
| return query(db, projectionIn, selection, selectionArgs, |
| groupBy, having, sortOrder, limit, null); |
| } |
| |
| /** |
| * Perform a query by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to query on |
| * @param projectionIn A list of which columns to return. Passing |
| * null will return all columns, which is discouraged to prevent |
| * reading data from storage that isn't going to be used. |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given URL. |
| * @param selectionArgs You may include ?s in selection, which |
| * will be replaced by the values from selectionArgs, in order |
| * that they appear in the selection. The values will be bound |
| * as Strings. |
| * @param groupBy A filter declaring how to group rows, formatted |
| * as an SQL {@code GROUP BY} clause (excluding the {@code GROUP BY} |
| * itself). Passing null will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in |
| * the cursor, if row grouping is being used, formatted as an |
| * SQL {@code HAVING} clause (excluding the {@code HAVING} itself). Passing |
| * null will cause all row groups to be included, and is |
| * required when row grouping is not being used. |
| * @param sortOrder How to order the rows, formatted as an SQL |
| * {@code ORDER BY} clause (excluding the {@code ORDER BY} itself). Passing null |
| * will use the default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as {@code LIMIT} clause. Passing null denotes no {@code LIMIT} clause. |
| * @param cancellationSignal A signal to cancel the operation in progress, or null if none. |
| * If the operation is canceled, then {@link OperationCanceledException} will be thrown |
| * when the query is executed. |
| * @return a cursor over the result set |
| * @see android.content.ContentResolver#query(android.net.Uri, String[], |
| * String, String[], String) |
| */ |
| public Cursor query(SQLiteDatabase db, String[] projectionIn, |
| String selection, String[] selectionArgs, String groupBy, |
| String having, String sortOrder, String limit, CancellationSignal cancellationSignal) { |
| if (mTables == null) { |
| return null; |
| } |
| |
| final String sql; |
| final String unwrappedSql = buildQuery( |
| projectionIn, selection, groupBy, having, |
| sortOrder, limit); |
| |
| if (isStrictColumns()) { |
| enforceStrictColumns(projectionIn); |
| } |
| if (isStrictGrammar()) { |
| enforceStrictGrammar(selection, groupBy, having, sortOrder, limit); |
| } |
| if (isStrict()) { |
| // Validate the user-supplied selection to detect syntactic anomalies |
| // in the selection string that could indicate a SQL injection attempt. |
| // The idea is to ensure that the selection clause is a valid SQL expression |
| // by compiling it twice: once wrapped in parentheses and once as |
| // originally specified. An attacker cannot create an expression that |
| // would escape the SQL expression while maintaining balanced parentheses |
| // in both the wrapped and original forms. |
| |
| // NOTE: The ordering of the below operations is important; we must |
| // execute the wrapped query to ensure the untrusted clause has been |
| // fully isolated. |
| |
| // Validate the unwrapped query |
| db.validateSql(unwrappedSql, cancellationSignal); // will throw if query is invalid |
| |
| // Execute wrapped query for extra protection |
| final String wrappedSql = buildQuery(projectionIn, wrap(selection), groupBy, |
| wrap(having), sortOrder, limit); |
| sql = wrappedSql; |
| } else { |
| // Execute unwrapped query |
| sql = unwrappedSql; |
| } |
| |
| final String[] sqlArgs = selectionArgs; |
| if (Log.isLoggable(TAG, Log.DEBUG)) { |
| if (Build.IS_DEBUGGABLE) { |
| Log.d(TAG, sql + " with args " + Arrays.toString(sqlArgs)); |
| } else { |
| Log.d(TAG, sql); |
| } |
| } |
| return db.rawQueryWithFactory( |
| mFactory, sql, sqlArgs, |
| SQLiteDatabase.findEditTable(mTables), |
| cancellationSignal); // will throw if query is invalid |
| } |
| |
| /** |
| * Perform an insert by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to insert on |
| * @return the row ID of the newly inserted row, or -1 if an error occurred |
| */ |
| public long insert(@NonNull SQLiteDatabase db, @NonNull ContentValues values) { |
| Objects.requireNonNull(mTables, "No tables defined"); |
| Objects.requireNonNull(db, "No database defined"); |
| Objects.requireNonNull(values, "No values defined"); |
| |
| if (isStrictColumns()) { |
| enforceStrictColumns(values); |
| } |
| |
| final String sql = buildInsert(values); |
| |
| final ArrayMap<String, Object> rawValues = values.getValues(); |
| final int valuesLength = rawValues.size(); |
| final Object[] sqlArgs = new Object[valuesLength]; |
| for (int i = 0; i < sqlArgs.length; i++) { |
| sqlArgs[i] = rawValues.valueAt(i); |
| } |
| if (Log.isLoggable(TAG, Log.DEBUG)) { |
| if (Build.IS_DEBUGGABLE) { |
| Log.d(TAG, sql + " with args " + Arrays.toString(sqlArgs)); |
| } else { |
| Log.d(TAG, sql); |
| } |
| } |
| return db.executeSql(sql, sqlArgs); |
| } |
| |
| /** |
| * Perform an update by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to update on |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given URL. |
| * @param selectionArgs You may include ?s in selection, which |
| * will be replaced by the values from selectionArgs, in order |
| * that they appear in the selection. The values will be bound |
| * as Strings. |
| * @return the number of rows updated |
| */ |
| public int update(@NonNull SQLiteDatabase db, @NonNull ContentValues values, |
| @Nullable String selection, @Nullable String[] selectionArgs) { |
| Objects.requireNonNull(mTables, "No tables defined"); |
| Objects.requireNonNull(db, "No database defined"); |
| Objects.requireNonNull(values, "No values defined"); |
| |
| final String sql; |
| final String unwrappedSql = buildUpdate(values, selection); |
| |
| if (isStrictColumns()) { |
| enforceStrictColumns(values); |
| } |
| if (isStrictGrammar()) { |
| enforceStrictGrammar(selection, null, null, null, null); |
| } |
| if (isStrict()) { |
| // Validate the user-supplied selection to detect syntactic anomalies |
| // in the selection string that could indicate a SQL injection attempt. |
| // The idea is to ensure that the selection clause is a valid SQL expression |
| // by compiling it twice: once wrapped in parentheses and once as |
| // originally specified. An attacker cannot create an expression that |
| // would escape the SQL expression while maintaining balanced parentheses |
| // in both the wrapped and original forms. |
| |
| // NOTE: The ordering of the below operations is important; we must |
| // execute the wrapped query to ensure the untrusted clause has been |
| // fully isolated. |
| |
| // Validate the unwrapped query |
| db.validateSql(unwrappedSql, null); // will throw if query is invalid |
| |
| // Execute wrapped query for extra protection |
| final String wrappedSql = buildUpdate(values, wrap(selection)); |
| sql = wrappedSql; |
| } else { |
| // Execute unwrapped query |
| sql = unwrappedSql; |
| } |
| |
| if (selectionArgs == null) { |
| selectionArgs = EmptyArray.STRING; |
| } |
| final ArrayMap<String, Object> rawValues = values.getValues(); |
| final int valuesLength = rawValues.size(); |
| final Object[] sqlArgs = new Object[valuesLength + selectionArgs.length]; |
| for (int i = 0; i < sqlArgs.length; i++) { |
| if (i < valuesLength) { |
| sqlArgs[i] = rawValues.valueAt(i); |
| } else { |
| sqlArgs[i] = selectionArgs[i - valuesLength]; |
| } |
| } |
| if (Log.isLoggable(TAG, Log.DEBUG)) { |
| if (Build.IS_DEBUGGABLE) { |
| Log.d(TAG, sql + " with args " + Arrays.toString(sqlArgs)); |
| } else { |
| Log.d(TAG, sql); |
| } |
| } |
| return db.executeSql(sql, sqlArgs); |
| } |
| |
| /** |
| * Perform a delete by combining all current settings and the |
| * information passed into this method. |
| * |
| * @param db the database to delete on |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given URL. |
| * @param selectionArgs You may include ?s in selection, which |
| * will be replaced by the values from selectionArgs, in order |
| * that they appear in the selection. The values will be bound |
| * as Strings. |
| * @return the number of rows deleted |
| */ |
| public int delete(@NonNull SQLiteDatabase db, @Nullable String selection, |
| @Nullable String[] selectionArgs) { |
| Objects.requireNonNull(mTables, "No tables defined"); |
| Objects.requireNonNull(db, "No database defined"); |
| |
| final String sql; |
| final String unwrappedSql = buildDelete(selection); |
| |
| if (isStrictGrammar()) { |
| enforceStrictGrammar(selection, null, null, null, null); |
| } |
| if (isStrict()) { |
| // Validate the user-supplied selection to detect syntactic anomalies |
| // in the selection string that could indicate a SQL injection attempt. |
| // The idea is to ensure that the selection clause is a valid SQL expression |
| // by compiling it twice: once wrapped in parentheses and once as |
| // originally specified. An attacker cannot create an expression that |
| // would escape the SQL expression while maintaining balanced parentheses |
| // in both the wrapped and original forms. |
| |
| // NOTE: The ordering of the below operations is important; we must |
| // execute the wrapped query to ensure the untrusted clause has been |
| // fully isolated. |
| |
| // Validate the unwrapped query |
| db.validateSql(unwrappedSql, null); // will throw if query is invalid |
| |
| // Execute wrapped query for extra protection |
| final String wrappedSql = buildDelete(wrap(selection)); |
| sql = wrappedSql; |
| } else { |
| // Execute unwrapped query |
| sql = unwrappedSql; |
| } |
| |
| final String[] sqlArgs = selectionArgs; |
| if (Log.isLoggable(TAG, Log.DEBUG)) { |
| if (Build.IS_DEBUGGABLE) { |
| Log.d(TAG, sql + " with args " + Arrays.toString(sqlArgs)); |
| } else { |
| Log.d(TAG, sql); |
| } |
| } |
| return db.executeSql(sql, sqlArgs); |
| } |
| |
| private void enforceStrictColumns(@Nullable String[] projection) { |
| Objects.requireNonNull(mProjectionMap, "No projection map defined"); |
| |
| computeProjection(projection); |
| } |
| |
| private void enforceStrictColumns(@NonNull ContentValues values) { |
| Objects.requireNonNull(mProjectionMap, "No projection map defined"); |
| |
| final ArrayMap<String, Object> rawValues = values.getValues(); |
| for (int i = 0; i < rawValues.size(); i++) { |
| final String column = rawValues.keyAt(i); |
| if (!mProjectionMap.containsKey(column)) { |
| throw new IllegalArgumentException("Invalid column " + column); |
| } |
| } |
| } |
| |
| private void enforceStrictGrammar(@Nullable String selection, @Nullable String groupBy, |
| @Nullable String having, @Nullable String sortOrder, @Nullable String limit) { |
| SQLiteTokenizer.tokenize(selection, SQLiteTokenizer.OPTION_NONE, |
| this::enforceStrictToken); |
| SQLiteTokenizer.tokenize(groupBy, SQLiteTokenizer.OPTION_NONE, |
| this::enforceStrictToken); |
| SQLiteTokenizer.tokenize(having, SQLiteTokenizer.OPTION_NONE, |
| this::enforceStrictToken); |
| SQLiteTokenizer.tokenize(sortOrder, SQLiteTokenizer.OPTION_NONE, |
| this::enforceStrictToken); |
| SQLiteTokenizer.tokenize(limit, SQLiteTokenizer.OPTION_NONE, |
| this::enforceStrictToken); |
| } |
| |
| private void enforceStrictToken(@NonNull String token) { |
| if (isTableOrColumn(token)) return; |
| if (SQLiteTokenizer.isFunction(token)) return; |
| if (SQLiteTokenizer.isType(token)) return; |
| |
| // Carefully block any tokens that are attempting to jump across query |
| // clauses or create subqueries, since they could leak data that should |
| // have been filtered by the trusted where clause |
| boolean isAllowedKeyword = SQLiteTokenizer.isKeyword(token); |
| switch (token.toUpperCase(Locale.US)) { |
| case "SELECT": |
| case "FROM": |
| case "WHERE": |
| case "GROUP": |
| case "HAVING": |
| case "WINDOW": |
| case "VALUES": |
| case "ORDER": |
| case "LIMIT": |
| isAllowedKeyword = false; |
| break; |
| } |
| if (!isAllowedKeyword) { |
| throw new IllegalArgumentException("Invalid token " + token); |
| } |
| } |
| |
| /** |
| * Construct a {@code SELECT} statement suitable for use in a group of |
| * {@code SELECT} statements that will be joined through {@code UNION} operators |
| * in buildUnionQuery. |
| * |
| * @param projectionIn A list of which columns to return. Passing |
| * null will return all columns, which is discouraged to |
| * prevent reading data from storage that isn't going to be |
| * used. |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given |
| * URL. |
| * @param groupBy A filter declaring how to group rows, formatted |
| * as an SQL {@code GROUP BY} clause (excluding the {@code GROUP BY} itself). |
| * Passing null will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in |
| * the cursor, if row grouping is being used, formatted as an |
| * SQL {@code HAVING} clause (excluding the {@code HAVING} itself). Passing |
| * null will cause all row groups to be included, and is |
| * required when row grouping is not being used. |
| * @param sortOrder How to order the rows, formatted as an SQL |
| * {@code ORDER BY} clause (excluding the {@code ORDER BY} itself). Passing null |
| * will use the default sort order, which may be unordered. |
| * @param limit Limits the number of rows returned by the query, |
| * formatted as {@code LIMIT} clause. Passing null denotes no {@code LIMIT} clause. |
| * @return the resulting SQL {@code SELECT} statement |
| */ |
| public String buildQuery( |
| String[] projectionIn, String selection, String groupBy, |
| String having, String sortOrder, String limit) { |
| String[] projection = computeProjection(projectionIn); |
| String where = computeWhere(selection); |
| |
| return buildQueryString( |
| mDistinct, mTables, projection, where, |
| groupBy, having, sortOrder, limit); |
| } |
| |
| /** |
| * @deprecated This method's signature is misleading since no SQL parameter |
| * substitution is carried out. The selection arguments parameter does not get |
| * used at all. To avoid confusion, call |
| * {@link #buildQuery(String[], String, String, String, String, String)} instead. |
| */ |
| @Deprecated |
| public String buildQuery( |
| String[] projectionIn, String selection, String[] selectionArgs, |
| String groupBy, String having, String sortOrder, String limit) { |
| return buildQuery(projectionIn, selection, groupBy, having, sortOrder, limit); |
| } |
| |
| /** {@hide} */ |
| public String buildInsert(ContentValues values) { |
| if (values == null || values.isEmpty()) { |
| throw new IllegalArgumentException("Empty values"); |
| } |
| |
| StringBuilder sql = new StringBuilder(120); |
| sql.append("INSERT INTO "); |
| sql.append(SQLiteDatabase.findEditTable(mTables)); |
| sql.append(" ("); |
| |
| final ArrayMap<String, Object> rawValues = values.getValues(); |
| for (int i = 0; i < rawValues.size(); i++) { |
| if (i > 0) { |
| sql.append(','); |
| } |
| sql.append(rawValues.keyAt(i)); |
| } |
| sql.append(") VALUES ("); |
| for (int i = 0; i < rawValues.size(); i++) { |
| if (i > 0) { |
| sql.append(','); |
| } |
| sql.append('?'); |
| } |
| sql.append(")"); |
| return sql.toString(); |
| } |
| |
| /** {@hide} */ |
| public String buildUpdate(ContentValues values, String selection) { |
| if (values == null || values.isEmpty()) { |
| throw new IllegalArgumentException("Empty values"); |
| } |
| |
| StringBuilder sql = new StringBuilder(120); |
| sql.append("UPDATE "); |
| sql.append(SQLiteDatabase.findEditTable(mTables)); |
| sql.append(" SET "); |
| |
| final ArrayMap<String, Object> rawValues = values.getValues(); |
| for (int i = 0; i < rawValues.size(); i++) { |
| if (i > 0) { |
| sql.append(','); |
| } |
| sql.append(rawValues.keyAt(i)); |
| sql.append("=?"); |
| } |
| |
| final String where = computeWhere(selection); |
| appendClause(sql, " WHERE ", where); |
| return sql.toString(); |
| } |
| |
| /** {@hide} */ |
| public String buildDelete(String selection) { |
| StringBuilder sql = new StringBuilder(120); |
| sql.append("DELETE FROM "); |
| sql.append(SQLiteDatabase.findEditTable(mTables)); |
| |
| final String where = computeWhere(selection); |
| appendClause(sql, " WHERE ", where); |
| return sql.toString(); |
| } |
| |
| /** |
| * Construct a {@code SELECT} statement suitable for use in a group of |
| * {@code SELECT} statements that will be joined through {@code UNION} operators |
| * in buildUnionQuery. |
| * |
| * @param typeDiscriminatorColumn the name of the result column |
| * whose cells will contain the name of the table from which |
| * each row was drawn. |
| * @param unionColumns the names of the columns to appear in the |
| * result. This may include columns that do not appear in the |
| * table this {@code SELECT} is querying (i.e. mTables), but that do |
| * appear in one of the other tables in the {@code UNION} query that we |
| * are constructing. |
| * @param columnsPresentInTable a Set of the names of the columns |
| * that appear in this table (i.e. in the table whose name is |
| * mTables). Since columns in unionColumns include columns that |
| * appear only in other tables, we use this array to distinguish |
| * which ones actually are present. Other columns will have |
| * NULL values for results from this subquery. |
| * @param computedColumnsOffset all columns in unionColumns before |
| * this index are included under the assumption that they're |
| * computed and therefore won't appear in columnsPresentInTable, |
| * e.g. "date * 1000 as normalized_date" |
| * @param typeDiscriminatorValue the value used for the |
| * type-discriminator column in this subquery |
| * @param selection A filter declaring which rows to return, |
| * formatted as an SQL {@code WHERE} clause (excluding the {@code WHERE} |
| * itself). Passing null will return all rows for the given |
| * URL. |
| * @param groupBy A filter declaring how to group rows, formatted |
| * as an SQL {@code GROUP BY} clause (excluding the {@code GROUP BY} itself). |
| * Passing null will cause the rows to not be grouped. |
| * @param having A filter declare which row groups to include in |
| * the cursor, if row grouping is being used, formatted as an |
| * SQL {@code HAVING} clause (excluding the {@code HAVING} itself). Passing |
| * null will cause all row groups to be included, and is |
| * required when row grouping is not being used. |
| * @return the resulting SQL {@code SELECT} statement |
| */ |
| public String buildUnionSubQuery( |
| String typeDiscriminatorColumn, |
| String[] unionColumns, |
| Set<String> columnsPresentInTable, |
| int computedColumnsOffset, |
| String typeDiscriminatorValue, |
| String selection, |
| String groupBy, |
| String having) { |
| int unionColumnsCount = unionColumns.length; |
| String[] projectionIn = new String[unionColumnsCount]; |
| |
| for (int i = 0; i < unionColumnsCount; i++) { |
| String unionColumn = unionColumns[i]; |
| |
| if (unionColumn.equals(typeDiscriminatorColumn)) { |
| projectionIn[i] = "'" + typeDiscriminatorValue + "' AS " |
| + typeDiscriminatorColumn; |
| } else if (i <= computedColumnsOffset |
| || columnsPresentInTable.contains(unionColumn)) { |
| projectionIn[i] = unionColumn; |
| } else { |
| projectionIn[i] = "NULL AS " + unionColumn; |
| } |
| } |
| return buildQuery( |
| projectionIn, selection, groupBy, having, |
| null /* sortOrder */, |
| null /* limit */); |
| } |
| |
| /** |
| * @deprecated This method's signature is misleading since no SQL parameter |
| * substitution is carried out. The selection arguments parameter does not get |
| * used at all. To avoid confusion, call |
| * {@link #buildUnionSubQuery} |
| * instead. |
| */ |
| @Deprecated |
| public String buildUnionSubQuery( |
| String typeDiscriminatorColumn, |
| String[] unionColumns, |
| Set<String> columnsPresentInTable, |
| int computedColumnsOffset, |
| String typeDiscriminatorValue, |
| String selection, |
| String[] selectionArgs, |
| String groupBy, |
| String having) { |
| return buildUnionSubQuery( |
| typeDiscriminatorColumn, unionColumns, columnsPresentInTable, |
| computedColumnsOffset, typeDiscriminatorValue, selection, |
| groupBy, having); |
| } |
| |
| /** |
| * Given a set of subqueries, all of which are {@code SELECT} statements, |
| * construct a query that returns the union of what those |
| * subqueries return. |
| * @param subQueries an array of SQL {@code SELECT} statements, all of |
| * which must have the same columns as the same positions in |
| * their results |
| * @param sortOrder How to order the rows, formatted as an SQL |
| * {@code ORDER BY} clause (excluding the {@code ORDER BY} itself). Passing |
| * null will use the default sort order, which may be unordered. |
| * @param limit The limit clause, which applies to the entire union result set |
| * |
| * @return the resulting SQL {@code SELECT} statement |
| */ |
| public String buildUnionQuery(String[] subQueries, String sortOrder, String limit) { |
| StringBuilder query = new StringBuilder(128); |
| int subQueryCount = subQueries.length; |
| String unionOperator = mDistinct ? " UNION " : " UNION ALL "; |
| |
| for (int i = 0; i < subQueryCount; i++) { |
| if (i > 0) { |
| query.append(unionOperator); |
| } |
| query.append(subQueries[i]); |
| } |
| appendClause(query, " ORDER BY ", sortOrder); |
| appendClause(query, " LIMIT ", limit); |
| return query.toString(); |
| } |
| |
| private static @NonNull String maybeWithOperator(@Nullable String operator, |
| @NonNull String column) { |
| if (operator != null) { |
| return operator + "(" + column + ")"; |
| } else { |
| return column; |
| } |
| } |
| |
| /** {@hide} */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| public @Nullable String[] computeProjection(@Nullable String[] projectionIn) { |
| if (!ArrayUtils.isEmpty(projectionIn)) { |
| String[] projectionOut = new String[projectionIn.length]; |
| for (int i = 0; i < projectionIn.length; i++) { |
| projectionOut[i] = computeSingleProjectionOrThrow(projectionIn[i]); |
| } |
| return projectionOut; |
| } else if (mProjectionMap != null) { |
| // Return all columns in projection map. |
| Set<Entry<String, String>> entrySet = mProjectionMap.entrySet(); |
| String[] projection = new String[entrySet.size()]; |
| Iterator<Entry<String, String>> entryIter = entrySet.iterator(); |
| int i = 0; |
| |
| while (entryIter.hasNext()) { |
| Entry<String, String> entry = entryIter.next(); |
| |
| // Don't include the _count column when people ask for no projection. |
| if (entry.getKey().equals(BaseColumns._COUNT)) { |
| continue; |
| } |
| projection[i++] = entry.getValue(); |
| } |
| return projection; |
| } |
| return null; |
| } |
| |
| private @NonNull String computeSingleProjectionOrThrow(@NonNull String userColumn) { |
| final String column = computeSingleProjection(userColumn); |
| if (column != null) { |
| return column; |
| } else { |
| throw new IllegalArgumentException("Invalid column " + userColumn); |
| } |
| } |
| |
| private @Nullable String computeSingleProjection(@NonNull String userColumn) { |
| // When no mapping provided, anything goes |
| if (mProjectionMap == null) { |
| return userColumn; |
| } |
| |
| String operator = null; |
| String column = mProjectionMap.get(userColumn); |
| |
| // When no direct match found, look for aggregation |
| if (column == null) { |
| final Matcher matcher = sAggregationPattern.matcher(userColumn); |
| if (matcher.matches()) { |
| operator = matcher.group(1); |
| userColumn = matcher.group(2); |
| column = mProjectionMap.get(userColumn); |
| } |
| } |
| |
| if (column != null) { |
| return maybeWithOperator(operator, column); |
| } |
| |
| if (mStrictFlags == 0 && |
| (userColumn.contains(" AS ") || userColumn.contains(" as "))) { |
| /* A column alias already exist */ |
| return maybeWithOperator(operator, userColumn); |
| } |
| |
| // If greylist is configured, we might be willing to let |
| // this custom column bypass our strict checks. |
| if (mProjectionGreylist != null) { |
| boolean match = false; |
| for (Pattern p : mProjectionGreylist) { |
| if (p.matcher(userColumn).matches()) { |
| match = true; |
| break; |
| } |
| } |
| |
| if (match) { |
| Log.w(TAG, "Allowing abusive custom column: " + userColumn); |
| return maybeWithOperator(operator, userColumn); |
| } |
| } |
| |
| return null; |
| } |
| |
| private boolean isTableOrColumn(String token) { |
| if (mTables.equals(token)) return true; |
| return computeSingleProjection(token) != null; |
| } |
| |
| /** {@hide} */ |
| public @Nullable String computeWhere(@Nullable String selection) { |
| final boolean hasInternal = !TextUtils.isEmpty(mWhereClause); |
| final boolean hasExternal = !TextUtils.isEmpty(selection); |
| |
| if (hasInternal || hasExternal) { |
| final StringBuilder where = new StringBuilder(); |
| if (hasInternal) { |
| where.append('(').append(mWhereClause).append(')'); |
| } |
| if (hasInternal && hasExternal) { |
| where.append(" AND "); |
| } |
| if (hasExternal) { |
| where.append('(').append(selection).append(')'); |
| } |
| return where.toString(); |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Wrap given argument in parenthesis, unless it's {@code null} or |
| * {@code ()}, in which case return it verbatim. |
| */ |
| private @Nullable String wrap(@Nullable String arg) { |
| if (TextUtils.isEmpty(arg)) { |
| return arg; |
| } else { |
| return "(" + arg + ")"; |
| } |
| } |
| } |
